JPH05118048A - Constructing method for foundation structure - Google Patents

Abstract

PURPOSE:To reduce the number of workers and shorten the term of work in construction, for instance, of a foundation for a building. CONSTITUTION:Precast reinforced concrete block footings 12, with openings 12a provided at the center in their longitudinal direction for execution of processing for the heads of piles 11 are arranged in the form of a circle so that they are placed adjacently with one another. The block footings 12 are connected with one another with PC connecting members 15, and a central space 16 formed at the center of the block footings 12 arranged in the form of a circle and the opening 12a of each of the block footings are filled with concrete 14, and thereby a structure for a foundation is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a foundation structure for a building, for example.

[0002]

2. Description of the Related Art A conventional foundation structure for a building is, as shown in FIG.
Is installed, a footing mold 2b is installed so as to surround the footing rebar 2a, and concrete is placed in the footing mold 2b to form a reinforced concrete footing 2.

[0003]

By the way, the above-mentioned conventional substructure requires a lot of skilled workers for work such as arranging the footing rebar 2a and assembling the footing form 2b, and at the same time working on site. There is a problem that the construction period on site is long as a whole because the period is long, it takes time to cure the concrete after placing the concrete, and it takes time to dismantle the formwork 2b.

[0004]

DISCLOSURE OF THE INVENTION The present invention was developed to solve the above-mentioned conventional problems, and its gist is to install a block footing made of precast reinforced concrete on a foundation. It is in the construction method of the foundation structure.

[0005]

According to the method for constructing a substructure according to the present invention, it is not necessary to perform complicated on-site work such as disposing footing rebars, assembling and dismantling footing formwork as in the conventional art. The work period can be remarkably shortened as a whole, because the number of workers can be reduced and the work period can be shortened, and since it is not necessary to cure concrete as in the conventional case, the time can be shortened accordingly.

[0006]

EXAMPLE FIG. 1 is a plan view of a regular octagonal precast reinforced concrete block footing 12 used when a foundation has piles.
An opening 12a for treating the pile head is provided at the center of the vertical direction of 12, and the peripheral surface of the opening 12a is provided with a concavo-convex or a bell for frictional resistance.

FIG. 2 is a plan view of a regular octagonal precast reinforced concrete block footing 12 used when the foundation has no piles.

FIG. 3 shows the above-mentioned opening on the foundation with the pile 11.
FIG. 3 is a cross-sectional view showing the installation of a block footing 12 having 12a, in which a reinforcing bar 13 is arranged in an opening 12a and concrete 14 is filled.

FIGS. 4 and 5 are a plan view and a cross-sectional view of a construction example in which there are four piles 11 in a large foundation, and an opening portion
Four block footings 12 having 12a are installed adjacent to each other in a circle, the block footings 12 are connected to each other by a PC connecting member 15 such as a PC steel rod or a PC steel wire, and a central gap 16 between the block footings 12 is provided. First, the reinforcing bars 12b are preliminarily projected on the surfaces facing each other of the block footing 12, or separate reinforcing bars are arranged to fill the concrete 14 and the opening 12a is filled with the concrete 14. Each block footing 12 has a PC connecting material 15
It is assumed that the through hole of is drilled in advance.

Further, as for the underground beam as one of the substructures, a precast reinforced concrete block subterranean beam may be used together to construct the substructure.

[0011]

According to the method for constructing a substructure according to the present invention described above, it is necessary to perform complicated on-site work such as disposing footing rebars, assembling a footing formwork, and dismantling as in the prior art. Since there is no need, the number of workers can be reduced and the working period can be shortened, and since it is not necessary to carry out concrete curing as in the conventional case, the time can be shortened by that much, and the construction period can be remarkably shortened.

[Brief description of drawings]

FIG. 1 is a plan view of a precast reinforced concrete block footing having an opening for treating a pile head at the center in the vertical direction.

FIG. 2 is a plan view of a precast reinforced concrete block footing without openings.

FIG. 3 is a cross-sectional view showing a construction example of the method of the present invention.

FIG. 4 is a plan view showing another construction example of the method of the present invention.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a cross-sectional view showing a conventional construction example.

[Explanation of symbols]

11 Pile 12 Block footing made of precast reinforced concrete 12a Opening for pile head treatment 12b Overhanging rebar 13 Reinforcing bar 14 Concrete 15 PC connecting material 16 Block footing Center gap between each other

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiro Okumura 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Co., Ltd. Tokyo Head Office (72) Inventor Yasunori Yoshioka 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo No. Kawasaki Steel Co., Ltd. Tokyo head office (72) Inventor Katsuji Kobayashi 4-39-25, Nishiarai, Adachi-ku, Tokyo

Claims (3)

[Claims] 1. A method for constructing a foundation structure, which comprises installing a block footing made of precast reinforced concrete on a foundation. 2. Precast reinforced concrete block footings are installed adjacent to each other in a circle on a foundation, said block footings are connected to each other by a PC connecting material, and concrete is filled in the central gap between the block footings. Construction method of the characteristic foundation structure. 3. When the foundation has piles, a block footing having an opening for treating a pile head in the longitudinal center is used, and the opening is filled with concrete. The method for constructing a substructure according to claim 2.